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DELWAQ is the engine of the D-Water Quality and D-Ecology programmes of the Delft3D suite. It is based on a rich library from which relevant substances and processes can be selected to quickly put water and sediment quality models together.

The processes library covers many aspects of water quality and ecology, from basic tracers, dissolved oxygen, nutrients, organic matter, inorganic suspended matter, heavy metals, bacteria and organic micro-pollutants, to complex algae and macrophyte dynamics. High performance solvers enable the simulation of long periods, often required to capture the full cycles of the processes being modelled.

The finite volume approach underlying DELWAQ allows it to be coupled to both the structured grid hydrodynamics of the current Delft3D-FLOW engine and the upcoming D-Flow Flexible Mesh engine (1D-2D-3D) of the Delft3D Flexible Mesh Suite (or even other models such as TELEMAC).

'DELWAQ in open source' is our invitation to all leading experts to collaborate in further development and research in the field of water quality, ecology and morphology using Delft3D. Feel free to post your DELWAQ related questions or comments in this dedicated forum space. If you are new to DELWAQ, the tutorial (in the user manual) is a good place to start. A list of DELWAQ related publications is available here.




Sub groups
D-Flow Flexible Mesh

Cohesive sediments & muddy systems



Delwaq2 NaN value for continuity-check

Gholamreza Shiravani, modified 1 Month ago.

Delwaq2 NaN value for continuity-check

Youngling Posts: 13 Join Date: 6/25/16 Recent Posts


After running Delwaq2, the continuity value becomes NaN in some part of Domain. Could you tell me the reason of that? When the Delwaq2-parameters beom NaN (None a Number)?

Michelle Jeuken, modified 27 Days ago.

RE: Delwaq2 NaN value for continuity-check

Jedi Knight Posts: 156 Join Date: 1/21/13 Recent Posts



This could not be due to any process parameter, since no processes are involved. It could happen when you have used a transport scheme that is not appropriate for the case you are modelling and/or when your time step is too big. Try using an other scheme and/or a smaller time step. High vertical dispersion could also cause problems. You could apply a factor on the vertical dispersion from FLOW.